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alpha radiation

noun

  1. alpha particles emitted from a radioactive isotope

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


alpha radiation

  1. Particles sent out by some radioactive nuclei, each particle consisting of two protons and two neutrons bound together. Alpha particles carry a positive charge. (See beta radiation and gamma radiation.)

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Alpha radiation, unlike gamma radiation, has low penetrating power; it can be stopped by clothing.

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